1. Research Associate, Louisiana Geological Survey, Louisiana State Univ., 3079 Energy, Coastal and Environmental Building, Baton Rouge, LA 70803.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., 3418G Patrick F. Taylor Hall, Baton Rouge, LA 70803 (corresponding author). E-mail: ftsai@lsu.edu
3. Associate Professor, Dept. of Petroleum Engineering, Louisiana State Univ., 3520B Patrick F. Taylor Hall Baton Rouge, LA 70803.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., 3513D Patrick F. Taylor Hall, Baton Rouge, LA 70803.